<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8" />
  <meta http-equiv="X-UA-Compatible" content="IE=edge" />
  <meta name="viewport" content="width=device-width, initial-scale=1.0" />
  <title>Document</title>
  <script src="https://cdn.jsdelivr.net/npm/vue@2.6.14/dist/vue.js"></script>
</head>

<body>
  <div id="app">
    <!-- 业务场景:input中输入什么,则p标签中展示什么-->

    <!-- 书写函数 -->
    输入框1:<input type="text" @input="changeMsg" /> <br />
  
    <!-- 不书写函数 -->
    输入框2:<input type="text" @input="msg=$event.target.value" />
    <p>{{msg}}</p>


    <!-- 
      input的 input事件和change事件 
      input 输入内容会被触发
      change失去焦点被触发
     -->


  </div>
  <script>
    Vue.config.productionTip = false;

    const vm = new Vue({
      el: "#app",
      data () {
        return {
          msg: "",
        };
      },
      methods: {
        changeMsg (e) {
          this.msg = e.target.value;
        },
      },
    });
  </script>
</body>

</html>